]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* -*- linux-c -*- |
2 | * viodasd.c | |
3 | * Authors: Dave Boutcher <boutcher@us.ibm.com> | |
4 | * Ryan Arnold <ryanarn@us.ibm.com> | |
5 | * Colin Devilbiss <devilbis@us.ibm.com> | |
6 | * Stephen Rothwell <sfr@au1.ibm.com> | |
7 | * | |
8 | * (C) Copyright 2000-2004 IBM Corporation | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License as | |
12 | * published by the Free Software Foundation; either version 2 of the | |
13 | * License, or (at your option) any later version. | |
14 | * | |
15 | * This program is distributed in the hope that it will be useful, | |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | * GNU General Public License for more details. | |
19 | * | |
20 | * You should have received a copy of the GNU General Public License | |
21 | * along with this program; if not, write to the Free Software | |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
23 | * | |
24 | * This routine provides access to disk space (termed "DASD" in historical | |
25 | * IBM terms) owned and managed by an OS/400 partition running on the | |
26 | * same box as this Linux partition. | |
27 | * | |
28 | * All disk operations are performed by sending messages back and forth to | |
29 | * the OS/400 partition. | |
30 | */ | |
31 | #include <linux/major.h> | |
32 | #include <linux/fs.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/kernel.h> | |
35 | #include <linux/blkdev.h> | |
36 | #include <linux/genhd.h> | |
37 | #include <linux/hdreg.h> | |
38 | #include <linux/errno.h> | |
39 | #include <linux/init.h> | |
40 | #include <linux/string.h> | |
41 | #include <linux/dma-mapping.h> | |
42 | #include <linux/completion.h> | |
43 | #include <linux/device.h> | |
44 | #include <linux/kernel.h> | |
45 | ||
46 | #include <asm/uaccess.h> | |
47 | #include <asm/vio.h> | |
1ec65d76 | 48 | #include <asm/iseries/hv_types.h> |
e45423ea | 49 | #include <asm/iseries/hv_lp_event.h> |
15b17189 | 50 | #include <asm/iseries/hv_lp_config.h> |
b4206778 | 51 | #include <asm/iseries/vio.h> |
1da177e4 LT |
52 | |
53 | MODULE_DESCRIPTION("iSeries Virtual DASD"); | |
54 | MODULE_AUTHOR("Dave Boutcher"); | |
55 | MODULE_LICENSE("GPL"); | |
56 | ||
57 | /* | |
58 | * We only support 7 partitions per physical disk....so with minor | |
59 | * numbers 0-255 we get a maximum of 32 disks. | |
60 | */ | |
61 | #define VIOD_GENHD_NAME "iseries/vd" | |
62 | #define VIOD_GENHD_DEVFS_NAME "iseries/disc" | |
63 | ||
64 | #define VIOD_VERS "1.64" | |
65 | ||
66 | #define VIOD_KERN_WARNING KERN_WARNING "viod: " | |
67 | #define VIOD_KERN_INFO KERN_INFO "viod: " | |
68 | ||
69 | enum { | |
70 | PARTITION_SHIFT = 3, | |
71 | MAX_DISKNO = HVMAXARCHITECTEDVIRTUALDISKS, | |
72 | MAX_DISK_NAME = sizeof(((struct gendisk *)0)->disk_name) | |
73 | }; | |
74 | ||
75 | static DEFINE_SPINLOCK(viodasd_spinlock); | |
76 | ||
77 | #define VIOMAXREQ 16 | |
78 | #define VIOMAXBLOCKDMA 12 | |
79 | ||
80 | #define DEVICE_NO(cell) ((struct viodasd_device *)(cell) - &viodasd_devices[0]) | |
81 | ||
82 | struct open_data { | |
83 | u64 disk_size; | |
84 | u16 max_disk; | |
85 | u16 cylinders; | |
86 | u16 tracks; | |
87 | u16 sectors; | |
88 | u16 bytes_per_sector; | |
89 | }; | |
90 | ||
91 | struct rw_data { | |
92 | u64 offset; | |
93 | struct { | |
94 | u32 token; | |
95 | u32 reserved; | |
96 | u64 len; | |
97 | } dma_info[VIOMAXBLOCKDMA]; | |
98 | }; | |
99 | ||
100 | struct vioblocklpevent { | |
101 | struct HvLpEvent event; | |
102 | u32 reserved; | |
103 | u16 version; | |
104 | u16 sub_result; | |
105 | u16 disk; | |
106 | u16 flags; | |
107 | union { | |
108 | struct open_data open_data; | |
109 | struct rw_data rw_data; | |
110 | u64 changed; | |
111 | } u; | |
112 | }; | |
113 | ||
114 | #define vioblockflags_ro 0x0001 | |
115 | ||
116 | enum vioblocksubtype { | |
117 | vioblockopen = 0x0001, | |
118 | vioblockclose = 0x0002, | |
119 | vioblockread = 0x0003, | |
120 | vioblockwrite = 0x0004, | |
121 | vioblockflush = 0x0005, | |
122 | vioblockcheck = 0x0007 | |
123 | }; | |
124 | ||
125 | struct viodasd_waitevent { | |
126 | struct completion com; | |
127 | int rc; | |
128 | u16 sub_result; | |
129 | int max_disk; /* open */ | |
130 | }; | |
131 | ||
132 | static const struct vio_error_entry viodasd_err_table[] = { | |
133 | { 0x0201, EINVAL, "Invalid Range" }, | |
134 | { 0x0202, EINVAL, "Invalid Token" }, | |
135 | { 0x0203, EIO, "DMA Error" }, | |
136 | { 0x0204, EIO, "Use Error" }, | |
137 | { 0x0205, EIO, "Release Error" }, | |
138 | { 0x0206, EINVAL, "Invalid Disk" }, | |
139 | { 0x0207, EBUSY, "Cant Lock" }, | |
140 | { 0x0208, EIO, "Already Locked" }, | |
141 | { 0x0209, EIO, "Already Unlocked" }, | |
142 | { 0x020A, EIO, "Invalid Arg" }, | |
143 | { 0x020B, EIO, "Bad IFS File" }, | |
144 | { 0x020C, EROFS, "Read Only Device" }, | |
145 | { 0x02FF, EIO, "Internal Error" }, | |
146 | { 0x0000, 0, NULL }, | |
147 | }; | |
148 | ||
149 | /* | |
150 | * Figure out the biggest I/O request (in sectors) we can accept | |
151 | */ | |
152 | #define VIODASD_MAXSECTORS (4096 / 512 * VIOMAXBLOCKDMA) | |
153 | ||
154 | /* | |
155 | * Number of disk I/O requests we've sent to OS/400 | |
156 | */ | |
157 | static int num_req_outstanding; | |
158 | ||
159 | /* | |
160 | * This is our internal structure for keeping track of disk devices | |
161 | */ | |
162 | struct viodasd_device { | |
163 | u16 cylinders; | |
164 | u16 tracks; | |
165 | u16 sectors; | |
166 | u16 bytes_per_sector; | |
167 | u64 size; | |
168 | int read_only; | |
169 | spinlock_t q_lock; | |
170 | struct gendisk *disk; | |
171 | struct device *dev; | |
172 | } viodasd_devices[MAX_DISKNO]; | |
173 | ||
174 | /* | |
175 | * External open entry point. | |
176 | */ | |
177 | static int viodasd_open(struct inode *ino, struct file *fil) | |
178 | { | |
179 | struct viodasd_device *d = ino->i_bdev->bd_disk->private_data; | |
180 | HvLpEvent_Rc hvrc; | |
181 | struct viodasd_waitevent we; | |
182 | u16 flags = 0; | |
183 | ||
184 | if (d->read_only) { | |
185 | if ((fil != NULL) && (fil->f_mode & FMODE_WRITE)) | |
186 | return -EROFS; | |
187 | flags = vioblockflags_ro; | |
188 | } | |
189 | ||
190 | init_completion(&we.com); | |
191 | ||
192 | /* Send the open event to OS/400 */ | |
193 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
194 | HvLpEvent_Type_VirtualIo, | |
195 | viomajorsubtype_blockio | vioblockopen, | |
196 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
197 | viopath_sourceinst(viopath_hostLp), | |
198 | viopath_targetinst(viopath_hostLp), | |
199 | (u64)(unsigned long)&we, VIOVERSION << 16, | |
200 | ((u64)DEVICE_NO(d) << 48) | ((u64)flags << 32), | |
201 | 0, 0, 0); | |
202 | if (hvrc != 0) { | |
203 | printk(VIOD_KERN_WARNING "HV open failed %d\n", (int)hvrc); | |
204 | return -EIO; | |
205 | } | |
206 | ||
207 | wait_for_completion(&we.com); | |
208 | ||
209 | /* Check the return code */ | |
210 | if (we.rc != 0) { | |
211 | const struct vio_error_entry *err = | |
212 | vio_lookup_rc(viodasd_err_table, we.sub_result); | |
213 | ||
214 | printk(VIOD_KERN_WARNING | |
215 | "bad rc opening disk: %d:0x%04x (%s)\n", | |
216 | (int)we.rc, we.sub_result, err->msg); | |
217 | return -EIO; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | /* | |
224 | * External release entry point. | |
225 | */ | |
226 | static int viodasd_release(struct inode *ino, struct file *fil) | |
227 | { | |
228 | struct viodasd_device *d = ino->i_bdev->bd_disk->private_data; | |
229 | HvLpEvent_Rc hvrc; | |
230 | ||
231 | /* Send the event to OS/400. We DON'T expect a response */ | |
232 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
233 | HvLpEvent_Type_VirtualIo, | |
234 | viomajorsubtype_blockio | vioblockclose, | |
235 | HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, | |
236 | viopath_sourceinst(viopath_hostLp), | |
237 | viopath_targetinst(viopath_hostLp), | |
238 | 0, VIOVERSION << 16, | |
239 | ((u64)DEVICE_NO(d) << 48) /* | ((u64)flags << 32) */, | |
240 | 0, 0, 0); | |
241 | if (hvrc != 0) | |
242 | printk(VIOD_KERN_WARNING "HV close call failed %d\n", | |
243 | (int)hvrc); | |
244 | return 0; | |
245 | } | |
246 | ||
247 | ||
248 | /* External ioctl entry point. | |
249 | */ | |
a885c8c4 | 250 | static int viodasd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 251 | { |
a885c8c4 CH |
252 | struct gendisk *disk = bdev->bd_disk; |
253 | struct viodasd_device *d = disk->private_data; | |
254 | ||
255 | geo->sectors = d->sectors ? d->sectors : 0; | |
256 | geo->heads = d->tracks ? d->tracks : 64; | |
257 | geo->cylinders = d->cylinders ? d->cylinders : | |
258 | get_capacity(disk) / (geo->cylinders * geo->heads); | |
1da177e4 | 259 | |
a885c8c4 | 260 | return 0; |
1da177e4 LT |
261 | } |
262 | ||
263 | /* | |
264 | * Our file operations table | |
265 | */ | |
266 | static struct block_device_operations viodasd_fops = { | |
267 | .owner = THIS_MODULE, | |
268 | .open = viodasd_open, | |
269 | .release = viodasd_release, | |
a885c8c4 | 270 | .getgeo = viodasd_getgeo, |
1da177e4 LT |
271 | }; |
272 | ||
273 | /* | |
274 | * End a request | |
275 | */ | |
276 | static void viodasd_end_request(struct request *req, int uptodate, | |
277 | int num_sectors) | |
278 | { | |
279 | if (end_that_request_first(req, uptodate, num_sectors)) | |
280 | return; | |
281 | add_disk_randomness(req->rq_disk); | |
8ffdc655 | 282 | end_that_request_last(req, uptodate); |
1da177e4 LT |
283 | } |
284 | ||
285 | /* | |
286 | * Send an actual I/O request to OS/400 | |
287 | */ | |
288 | static int send_request(struct request *req) | |
289 | { | |
290 | u64 start; | |
291 | int direction; | |
292 | int nsg; | |
293 | u16 viocmd; | |
294 | HvLpEvent_Rc hvrc; | |
295 | struct vioblocklpevent *bevent; | |
296 | struct scatterlist sg[VIOMAXBLOCKDMA]; | |
297 | int sgindex; | |
298 | int statindex; | |
299 | struct viodasd_device *d; | |
300 | unsigned long flags; | |
301 | ||
302 | start = (u64)req->sector << 9; | |
303 | ||
304 | if (rq_data_dir(req) == READ) { | |
305 | direction = DMA_FROM_DEVICE; | |
306 | viocmd = viomajorsubtype_blockio | vioblockread; | |
307 | statindex = 0; | |
308 | } else { | |
309 | direction = DMA_TO_DEVICE; | |
310 | viocmd = viomajorsubtype_blockio | vioblockwrite; | |
311 | statindex = 1; | |
312 | } | |
313 | ||
314 | d = req->rq_disk->private_data; | |
315 | ||
316 | /* Now build the scatter-gather list */ | |
317 | nsg = blk_rq_map_sg(req->q, req, sg); | |
318 | nsg = dma_map_sg(d->dev, sg, nsg, direction); | |
319 | ||
320 | spin_lock_irqsave(&viodasd_spinlock, flags); | |
321 | num_req_outstanding++; | |
322 | ||
323 | /* This optimization handles a single DMA block */ | |
324 | if (nsg == 1) | |
325 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
326 | HvLpEvent_Type_VirtualIo, viocmd, | |
327 | HvLpEvent_AckInd_DoAck, | |
328 | HvLpEvent_AckType_ImmediateAck, | |
329 | viopath_sourceinst(viopath_hostLp), | |
330 | viopath_targetinst(viopath_hostLp), | |
331 | (u64)(unsigned long)req, VIOVERSION << 16, | |
332 | ((u64)DEVICE_NO(d) << 48), start, | |
333 | ((u64)sg_dma_address(&sg[0])) << 32, | |
334 | sg_dma_len(&sg[0])); | |
335 | else { | |
336 | bevent = (struct vioblocklpevent *) | |
337 | vio_get_event_buffer(viomajorsubtype_blockio); | |
338 | if (bevent == NULL) { | |
339 | printk(VIOD_KERN_WARNING | |
340 | "error allocating disk event buffer\n"); | |
341 | goto error_ret; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Now build up the actual request. Note that we store | |
346 | * the pointer to the request in the correlation | |
347 | * token so we can match the response up later | |
348 | */ | |
349 | memset(bevent, 0, sizeof(struct vioblocklpevent)); | |
350 | bevent->event.xFlags.xValid = 1; | |
351 | bevent->event.xFlags.xFunction = HvLpEvent_Function_Int; | |
352 | bevent->event.xFlags.xAckInd = HvLpEvent_AckInd_DoAck; | |
353 | bevent->event.xFlags.xAckType = HvLpEvent_AckType_ImmediateAck; | |
354 | bevent->event.xType = HvLpEvent_Type_VirtualIo; | |
355 | bevent->event.xSubtype = viocmd; | |
356 | bevent->event.xSourceLp = HvLpConfig_getLpIndex(); | |
357 | bevent->event.xTargetLp = viopath_hostLp; | |
358 | bevent->event.xSizeMinus1 = | |
359 | offsetof(struct vioblocklpevent, u.rw_data.dma_info) + | |
360 | (sizeof(bevent->u.rw_data.dma_info[0]) * nsg) - 1; | |
361 | bevent->event.xSourceInstanceId = | |
362 | viopath_sourceinst(viopath_hostLp); | |
363 | bevent->event.xTargetInstanceId = | |
364 | viopath_targetinst(viopath_hostLp); | |
365 | bevent->event.xCorrelationToken = (u64)req; | |
366 | bevent->version = VIOVERSION; | |
367 | bevent->disk = DEVICE_NO(d); | |
368 | bevent->u.rw_data.offset = start; | |
369 | ||
370 | /* | |
371 | * Copy just the dma information from the sg list | |
372 | * into the request | |
373 | */ | |
374 | for (sgindex = 0; sgindex < nsg; sgindex++) { | |
375 | bevent->u.rw_data.dma_info[sgindex].token = | |
376 | sg_dma_address(&sg[sgindex]); | |
377 | bevent->u.rw_data.dma_info[sgindex].len = | |
378 | sg_dma_len(&sg[sgindex]); | |
379 | } | |
380 | ||
381 | /* Send the request */ | |
382 | hvrc = HvCallEvent_signalLpEvent(&bevent->event); | |
383 | vio_free_event_buffer(viomajorsubtype_blockio, bevent); | |
384 | } | |
385 | ||
386 | if (hvrc != HvLpEvent_Rc_Good) { | |
387 | printk(VIOD_KERN_WARNING | |
388 | "error sending disk event to OS/400 (rc %d)\n", | |
389 | (int)hvrc); | |
390 | goto error_ret; | |
391 | } | |
392 | spin_unlock_irqrestore(&viodasd_spinlock, flags); | |
393 | return 0; | |
394 | ||
395 | error_ret: | |
396 | num_req_outstanding--; | |
397 | spin_unlock_irqrestore(&viodasd_spinlock, flags); | |
398 | dma_unmap_sg(d->dev, sg, nsg, direction); | |
399 | return -1; | |
400 | } | |
401 | ||
402 | /* | |
403 | * This is the external request processing routine | |
404 | */ | |
405 | static void do_viodasd_request(request_queue_t *q) | |
406 | { | |
407 | struct request *req; | |
408 | ||
409 | /* | |
410 | * If we already have the maximum number of requests | |
411 | * outstanding to OS/400 just bail out. We'll come | |
412 | * back later. | |
413 | */ | |
414 | while (num_req_outstanding < VIOMAXREQ) { | |
415 | req = elv_next_request(q); | |
416 | if (req == NULL) | |
417 | return; | |
418 | /* dequeue the current request from the queue */ | |
419 | blkdev_dequeue_request(req); | |
420 | /* check that request contains a valid command */ | |
421 | if (!blk_fs_request(req)) { | |
422 | viodasd_end_request(req, 0, req->hard_nr_sectors); | |
423 | continue; | |
424 | } | |
425 | /* Try sending the request */ | |
426 | if (send_request(req) != 0) | |
427 | viodasd_end_request(req, 0, req->hard_nr_sectors); | |
428 | } | |
429 | } | |
430 | ||
431 | /* | |
432 | * Probe a single disk and fill in the viodasd_device structure | |
433 | * for it. | |
434 | */ | |
435 | static void probe_disk(struct viodasd_device *d) | |
436 | { | |
437 | HvLpEvent_Rc hvrc; | |
438 | struct viodasd_waitevent we; | |
439 | int dev_no = DEVICE_NO(d); | |
440 | struct gendisk *g; | |
441 | struct request_queue *q; | |
442 | u16 flags = 0; | |
443 | ||
444 | retry: | |
445 | init_completion(&we.com); | |
446 | ||
447 | /* Send the open event to OS/400 */ | |
448 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
449 | HvLpEvent_Type_VirtualIo, | |
450 | viomajorsubtype_blockio | vioblockopen, | |
451 | HvLpEvent_AckInd_DoAck, HvLpEvent_AckType_ImmediateAck, | |
452 | viopath_sourceinst(viopath_hostLp), | |
453 | viopath_targetinst(viopath_hostLp), | |
454 | (u64)(unsigned long)&we, VIOVERSION << 16, | |
455 | ((u64)dev_no << 48) | ((u64)flags<< 32), | |
456 | 0, 0, 0); | |
457 | if (hvrc != 0) { | |
458 | printk(VIOD_KERN_WARNING "bad rc on HV open %d\n", (int)hvrc); | |
459 | return; | |
460 | } | |
461 | ||
462 | wait_for_completion(&we.com); | |
463 | ||
464 | if (we.rc != 0) { | |
465 | if (flags != 0) | |
466 | return; | |
467 | /* try again with read only flag set */ | |
468 | flags = vioblockflags_ro; | |
469 | goto retry; | |
470 | } | |
471 | if (we.max_disk > (MAX_DISKNO - 1)) { | |
472 | static int warned; | |
473 | ||
474 | if (warned == 0) { | |
475 | warned++; | |
476 | printk(VIOD_KERN_INFO | |
477 | "Only examining the first %d " | |
478 | "of %d disks connected\n", | |
479 | MAX_DISKNO, we.max_disk + 1); | |
480 | } | |
481 | } | |
482 | ||
483 | /* Send the close event to OS/400. We DON'T expect a response */ | |
484 | hvrc = HvCallEvent_signalLpEventFast(viopath_hostLp, | |
485 | HvLpEvent_Type_VirtualIo, | |
486 | viomajorsubtype_blockio | vioblockclose, | |
487 | HvLpEvent_AckInd_NoAck, HvLpEvent_AckType_ImmediateAck, | |
488 | viopath_sourceinst(viopath_hostLp), | |
489 | viopath_targetinst(viopath_hostLp), | |
490 | 0, VIOVERSION << 16, | |
491 | ((u64)dev_no << 48) | ((u64)flags << 32), | |
492 | 0, 0, 0); | |
493 | if (hvrc != 0) { | |
494 | printk(VIOD_KERN_WARNING | |
495 | "bad rc sending event to OS/400 %d\n", (int)hvrc); | |
496 | return; | |
497 | } | |
498 | /* create the request queue for the disk */ | |
499 | spin_lock_init(&d->q_lock); | |
500 | q = blk_init_queue(do_viodasd_request, &d->q_lock); | |
501 | if (q == NULL) { | |
502 | printk(VIOD_KERN_WARNING "cannot allocate queue for disk %d\n", | |
503 | dev_no); | |
504 | return; | |
505 | } | |
506 | g = alloc_disk(1 << PARTITION_SHIFT); | |
507 | if (g == NULL) { | |
508 | printk(VIOD_KERN_WARNING | |
509 | "cannot allocate disk structure for disk %d\n", | |
510 | dev_no); | |
511 | blk_cleanup_queue(q); | |
512 | return; | |
513 | } | |
514 | ||
515 | d->disk = g; | |
516 | blk_queue_max_hw_segments(q, VIOMAXBLOCKDMA); | |
517 | blk_queue_max_phys_segments(q, VIOMAXBLOCKDMA); | |
518 | blk_queue_max_sectors(q, VIODASD_MAXSECTORS); | |
519 | g->major = VIODASD_MAJOR; | |
520 | g->first_minor = dev_no << PARTITION_SHIFT; | |
521 | if (dev_no >= 26) | |
522 | snprintf(g->disk_name, sizeof(g->disk_name), | |
523 | VIOD_GENHD_NAME "%c%c", | |
524 | 'a' + (dev_no / 26) - 1, 'a' + (dev_no % 26)); | |
525 | else | |
526 | snprintf(g->disk_name, sizeof(g->disk_name), | |
527 | VIOD_GENHD_NAME "%c", 'a' + (dev_no % 26)); | |
528 | snprintf(g->devfs_name, sizeof(g->devfs_name), | |
529 | "%s%d", VIOD_GENHD_DEVFS_NAME, dev_no); | |
530 | g->fops = &viodasd_fops; | |
531 | g->queue = q; | |
532 | g->private_data = d; | |
533 | g->driverfs_dev = d->dev; | |
534 | set_capacity(g, d->size >> 9); | |
535 | ||
536 | printk(VIOD_KERN_INFO "disk %d: %lu sectors (%lu MB) " | |
537 | "CHS=%d/%d/%d sector size %d%s\n", | |
538 | dev_no, (unsigned long)(d->size >> 9), | |
539 | (unsigned long)(d->size >> 20), | |
540 | (int)d->cylinders, (int)d->tracks, | |
541 | (int)d->sectors, (int)d->bytes_per_sector, | |
542 | d->read_only ? " (RO)" : ""); | |
543 | ||
544 | /* register us in the global list */ | |
545 | add_disk(g); | |
546 | } | |
547 | ||
548 | /* returns the total number of scatterlist elements converted */ | |
549 | static int block_event_to_scatterlist(const struct vioblocklpevent *bevent, | |
550 | struct scatterlist *sg, int *total_len) | |
551 | { | |
552 | int i, numsg; | |
553 | const struct rw_data *rw_data = &bevent->u.rw_data; | |
554 | static const int offset = | |
555 | offsetof(struct vioblocklpevent, u.rw_data.dma_info); | |
556 | static const int element_size = sizeof(rw_data->dma_info[0]); | |
557 | ||
558 | numsg = ((bevent->event.xSizeMinus1 + 1) - offset) / element_size; | |
559 | if (numsg > VIOMAXBLOCKDMA) | |
560 | numsg = VIOMAXBLOCKDMA; | |
561 | ||
562 | *total_len = 0; | |
563 | memset(sg, 0, sizeof(sg[0]) * VIOMAXBLOCKDMA); | |
564 | ||
565 | for (i = 0; (i < numsg) && (rw_data->dma_info[i].len > 0); ++i) { | |
566 | sg_dma_address(&sg[i]) = rw_data->dma_info[i].token; | |
567 | sg_dma_len(&sg[i]) = rw_data->dma_info[i].len; | |
568 | *total_len += rw_data->dma_info[i].len; | |
569 | } | |
570 | return i; | |
571 | } | |
572 | ||
573 | /* | |
574 | * Restart all queues, starting with the one _after_ the disk given, | |
575 | * thus reducing the chance of starvation of higher numbered disks. | |
576 | */ | |
577 | static void viodasd_restart_all_queues_starting_from(int first_index) | |
578 | { | |
579 | int i; | |
580 | ||
581 | for (i = first_index + 1; i < MAX_DISKNO; ++i) | |
582 | if (viodasd_devices[i].disk) | |
583 | blk_run_queue(viodasd_devices[i].disk->queue); | |
584 | for (i = 0; i <= first_index; ++i) | |
585 | if (viodasd_devices[i].disk) | |
586 | blk_run_queue(viodasd_devices[i].disk->queue); | |
587 | } | |
588 | ||
589 | /* | |
590 | * For read and write requests, decrement the number of outstanding requests, | |
591 | * Free the DMA buffers we allocated. | |
592 | */ | |
593 | static int viodasd_handle_read_write(struct vioblocklpevent *bevent) | |
594 | { | |
595 | int num_sg, num_sect, pci_direction, total_len; | |
596 | struct request *req; | |
597 | struct scatterlist sg[VIOMAXBLOCKDMA]; | |
598 | struct HvLpEvent *event = &bevent->event; | |
599 | unsigned long irq_flags; | |
600 | struct viodasd_device *d; | |
601 | int error; | |
602 | spinlock_t *qlock; | |
603 | ||
604 | num_sg = block_event_to_scatterlist(bevent, sg, &total_len); | |
605 | num_sect = total_len >> 9; | |
606 | if (event->xSubtype == (viomajorsubtype_blockio | vioblockread)) | |
607 | pci_direction = DMA_FROM_DEVICE; | |
608 | else | |
609 | pci_direction = DMA_TO_DEVICE; | |
610 | req = (struct request *)bevent->event.xCorrelationToken; | |
611 | d = req->rq_disk->private_data; | |
612 | ||
613 | dma_unmap_sg(d->dev, sg, num_sg, pci_direction); | |
614 | ||
615 | /* | |
616 | * Since this is running in interrupt mode, we need to make sure | |
617 | * we're not stepping on any global I/O operations | |
618 | */ | |
619 | spin_lock_irqsave(&viodasd_spinlock, irq_flags); | |
620 | num_req_outstanding--; | |
621 | spin_unlock_irqrestore(&viodasd_spinlock, irq_flags); | |
622 | ||
623 | error = event->xRc != HvLpEvent_Rc_Good; | |
624 | if (error) { | |
625 | const struct vio_error_entry *err; | |
626 | err = vio_lookup_rc(viodasd_err_table, bevent->sub_result); | |
627 | printk(VIOD_KERN_WARNING "read/write error %d:0x%04x (%s)\n", | |
628 | event->xRc, bevent->sub_result, err->msg); | |
629 | num_sect = req->hard_nr_sectors; | |
630 | } | |
631 | qlock = req->q->queue_lock; | |
632 | spin_lock_irqsave(qlock, irq_flags); | |
633 | viodasd_end_request(req, !error, num_sect); | |
634 | spin_unlock_irqrestore(qlock, irq_flags); | |
635 | ||
636 | /* Finally, try to get more requests off of this device's queue */ | |
637 | viodasd_restart_all_queues_starting_from(DEVICE_NO(d)); | |
638 | ||
639 | return 0; | |
640 | } | |
641 | ||
642 | /* This routine handles incoming block LP events */ | |
643 | static void handle_block_event(struct HvLpEvent *event) | |
644 | { | |
645 | struct vioblocklpevent *bevent = (struct vioblocklpevent *)event; | |
646 | struct viodasd_waitevent *pwe; | |
647 | ||
648 | if (event == NULL) | |
649 | /* Notification that a partition went away! */ | |
650 | return; | |
651 | /* First, we should NEVER get an int here...only acks */ | |
652 | if (event->xFlags.xFunction == HvLpEvent_Function_Int) { | |
653 | printk(VIOD_KERN_WARNING | |
654 | "Yikes! got an int in viodasd event handler!\n"); | |
655 | if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) { | |
656 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | |
657 | HvCallEvent_ackLpEvent(event); | |
658 | } | |
659 | } | |
660 | ||
661 | switch (event->xSubtype & VIOMINOR_SUBTYPE_MASK) { | |
662 | case vioblockopen: | |
663 | /* | |
664 | * Handle a response to an open request. We get all the | |
665 | * disk information in the response, so update it. The | |
666 | * correlation token contains a pointer to a waitevent | |
667 | * structure that has a completion in it. update the | |
668 | * return code in the waitevent structure and post the | |
669 | * completion to wake up the guy who sent the request | |
670 | */ | |
671 | pwe = (struct viodasd_waitevent *)event->xCorrelationToken; | |
672 | pwe->rc = event->xRc; | |
673 | pwe->sub_result = bevent->sub_result; | |
674 | if (event->xRc == HvLpEvent_Rc_Good) { | |
675 | const struct open_data *data = &bevent->u.open_data; | |
676 | struct viodasd_device *device = | |
677 | &viodasd_devices[bevent->disk]; | |
678 | device->read_only = | |
679 | bevent->flags & vioblockflags_ro; | |
680 | device->size = data->disk_size; | |
681 | device->cylinders = data->cylinders; | |
682 | device->tracks = data->tracks; | |
683 | device->sectors = data->sectors; | |
684 | device->bytes_per_sector = data->bytes_per_sector; | |
685 | pwe->max_disk = data->max_disk; | |
686 | } | |
687 | complete(&pwe->com); | |
688 | break; | |
689 | case vioblockclose: | |
690 | break; | |
691 | case vioblockread: | |
692 | case vioblockwrite: | |
693 | viodasd_handle_read_write(bevent); | |
694 | break; | |
695 | ||
696 | default: | |
697 | printk(VIOD_KERN_WARNING "invalid subtype!"); | |
698 | if (event->xFlags.xAckInd == HvLpEvent_AckInd_DoAck) { | |
699 | event->xRc = HvLpEvent_Rc_InvalidSubtype; | |
700 | HvCallEvent_ackLpEvent(event); | |
701 | } | |
702 | } | |
703 | } | |
704 | ||
705 | /* | |
706 | * Get the driver to reprobe for more disks. | |
707 | */ | |
708 | static ssize_t probe_disks(struct device_driver *drv, const char *buf, | |
709 | size_t count) | |
710 | { | |
711 | struct viodasd_device *d; | |
712 | ||
713 | for (d = viodasd_devices; d < &viodasd_devices[MAX_DISKNO]; d++) { | |
714 | if (d->disk == NULL) | |
715 | probe_disk(d); | |
716 | } | |
717 | return count; | |
718 | } | |
719 | static DRIVER_ATTR(probe, S_IWUSR, NULL, probe_disks); | |
720 | ||
721 | static int viodasd_probe(struct vio_dev *vdev, const struct vio_device_id *id) | |
722 | { | |
723 | struct viodasd_device *d = &viodasd_devices[vdev->unit_address]; | |
724 | ||
725 | d->dev = &vdev->dev; | |
726 | probe_disk(d); | |
727 | if (d->disk == NULL) | |
728 | return -ENODEV; | |
729 | return 0; | |
730 | } | |
731 | ||
732 | static int viodasd_remove(struct vio_dev *vdev) | |
733 | { | |
734 | struct viodasd_device *d; | |
735 | ||
736 | d = &viodasd_devices[vdev->unit_address]; | |
737 | if (d->disk) { | |
738 | del_gendisk(d->disk); | |
739 | blk_cleanup_queue(d->disk->queue); | |
740 | put_disk(d->disk); | |
741 | d->disk = NULL; | |
742 | } | |
743 | d->dev = NULL; | |
744 | return 0; | |
745 | } | |
746 | ||
747 | /** | |
748 | * viodasd_device_table: Used by vio.c to match devices that we | |
749 | * support. | |
750 | */ | |
751 | static struct vio_device_id viodasd_device_table[] __devinitdata = { | |
752 | { "viodasd", "" }, | |
fb120da6 | 753 | { "", "" } |
1da177e4 | 754 | }; |
1da177e4 | 755 | MODULE_DEVICE_TABLE(vio, viodasd_device_table); |
915124d8 | 756 | |
1da177e4 | 757 | static struct vio_driver viodasd_driver = { |
1da177e4 LT |
758 | .id_table = viodasd_device_table, |
759 | .probe = viodasd_probe, | |
6fdf5392 SR |
760 | .remove = viodasd_remove, |
761 | .driver = { | |
762 | .name = "viodasd", | |
915124d8 | 763 | .owner = THIS_MODULE, |
6fdf5392 | 764 | } |
1da177e4 LT |
765 | }; |
766 | ||
767 | /* | |
768 | * Initialize the whole device driver. Handle module and non-module | |
769 | * versions | |
770 | */ | |
771 | static int __init viodasd_init(void) | |
772 | { | |
773 | int rc; | |
774 | ||
775 | /* Try to open to our host lp */ | |
776 | if (viopath_hostLp == HvLpIndexInvalid) | |
777 | vio_set_hostlp(); | |
778 | ||
779 | if (viopath_hostLp == HvLpIndexInvalid) { | |
780 | printk(VIOD_KERN_WARNING "invalid hosting partition\n"); | |
781 | return -EIO; | |
782 | } | |
783 | ||
784 | printk(VIOD_KERN_INFO "vers " VIOD_VERS ", hosting partition %d\n", | |
785 | viopath_hostLp); | |
786 | ||
787 | /* register the block device */ | |
788 | if (register_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME)) { | |
789 | printk(VIOD_KERN_WARNING | |
790 | "Unable to get major number %d for %s\n", | |
791 | VIODASD_MAJOR, VIOD_GENHD_NAME); | |
792 | return -EIO; | |
793 | } | |
794 | /* Actually open the path to the hosting partition */ | |
795 | if (viopath_open(viopath_hostLp, viomajorsubtype_blockio, | |
796 | VIOMAXREQ + 2)) { | |
797 | printk(VIOD_KERN_WARNING | |
798 | "error opening path to host partition %d\n", | |
799 | viopath_hostLp); | |
800 | unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); | |
801 | return -EIO; | |
802 | } | |
803 | ||
804 | /* Initialize our request handler */ | |
805 | vio_setHandler(viomajorsubtype_blockio, handle_block_event); | |
806 | ||
807 | rc = vio_register_driver(&viodasd_driver); | |
808 | if (rc == 0) | |
809 | driver_create_file(&viodasd_driver.driver, &driver_attr_probe); | |
810 | return rc; | |
811 | } | |
812 | module_init(viodasd_init); | |
813 | ||
814 | void viodasd_exit(void) | |
815 | { | |
816 | driver_remove_file(&viodasd_driver.driver, &driver_attr_probe); | |
817 | vio_unregister_driver(&viodasd_driver); | |
818 | vio_clearHandler(viomajorsubtype_blockio); | |
819 | unregister_blkdev(VIODASD_MAJOR, VIOD_GENHD_NAME); | |
820 | viopath_close(viopath_hostLp, viomajorsubtype_blockio, VIOMAXREQ + 2); | |
821 | } | |
822 | ||
823 | module_exit(viodasd_exit); |